Sam is just short of 3 months. This week, he had his first C5 vaccination (second vaccination). He's been a bit off his food these last few days. At first, I thought it was just the heat. We've been sweltering with consecutive days of way over 100F. Even though he's had plenty of water and his wee is clear and copious, his appetite just seemed to not be the same. At first, I thought he might possibly be getting bored of his food. I feed him almost exclusively on Eukanuba medium puppy breed biscuits. And then I thought it might be because of his vaccination. This morning, I put water in the remainder of his biscuits which he hadn't eaten. After a bit of sniffing, he woofed down the moistened biscuits. Does this mean that he's teething? Could this be the reason he's more bitey than usual? Or is he just getting bored?